In this current advisory there are changes to the Short Option Minimum and/or the Volatility Scan Range.Below are descriptions of what each change affects:

-The Short Option Minimum (SOM) is a charge that is applied only to portfolios concentrated in short options that do not generate a minimum margin requirement level when margins are calculated using the normal 16 SPAN scenarios. The SOM charge per short calls or short puts is a percentage of the outright margin on one underlying futures contract.

-The volatility scan range is the change in implied volatility that is used in each of SPAN’s 16 scenarios.

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